CVE-2009-1535
The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a "/protected/" initial pathname component to bypass the password protection on the protected\ folder, aka "IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1122.
Key facts
- CVSS score
- 7.5 (v2.0)
- Severity
- HIGH
- CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P- Weakness (CWE)
- CWE-287
- EPSS score
- 98.1% (100th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2009-1531)
- Published
- June 10, 2009
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2009-1531 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- microsoft / internet information services
- microsoft / internet information services
- microsoft / windows server 2003
- microsoft / windows server 2003
- microsoft / windows server 2003
- microsoft / windows xp
- microsoft / windows xp
- microsoft / windows xp
References
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0135.html(Broken Link)
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0139.html(Broken Link)
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0144.html(Broken Link)
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/att-0135/IIS_Advisory.pdf(Broken Link)
- http://blog.zoller.lu/2009/05/iis-6-webdac-auth-bypass-and-data.html(Third Party Advisory)
- http://isc.sans.org/diary.html?n&storyid=6397(Third Party Advisory)
- http://view.samurajdata.se/psview.php?id=023287d6&page=1(Broken Link)
- http://www.attrition.org/pipermail/vim/2009-June/002192.html(Third Party Advisory)
- http://www.us-cert.gov/cas/techalerts/TA09-160A.html(Third Party Advisory, US Government Resource)
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-020(Patch, Vendor Advisory)
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6029(Third Party Advisory)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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